QSC RMX1450a Power Amplifier

  • $699.99

The RMXa Series is an update on a proven line of amplifiers line of amplifiers combining legendary QSC reliability, audio performance and affordability. Entertainers and touring users can continue to rely on the RMXa as one of the leading amplifier series in the world. For mid-power applications, the 2RU models offer 4O power ratings from 300 to 800 watts per channel. The RMXa Series amplifiers from QSC offer true professional-quality performance at an affordable price. RMXa amplifiers include a comprehensive set of features including XLR and 1/4” balanced inputs, Speakon® and binding post outposts for convenient connectivity. User-defeatable clip limiters and selectable low-frequency filters optimize sonic performance. 

  • Compact size — up to 2500 watts in two rack spaces, or 5000 watts in three rack spaces
  • High-current toroidal transformers, for greater 2-ohm power and low noise
  • Independent user-defeatable clip limiters reduce distortion
  • Selectable low-frequency filters (30 Hz or 50 Hz) protect speakers and increase headroom
  • The 4000-watt RMX4050a operates on a standard 15 amp plug (120 V)
  • Both the RMX4050a and the RMX5050a feature a dual mono, high-current power supply for increased reliability and performance
  • The RMX4050a's particularly exceptional combination of cooling capacity and electrical efficiency provides robust thermal performance suitable for high continuous power in 2-ohm stereo or 4-ohm bridged applications.
  • Balanced 1/4-inch (6.3 mm) TRS, XLR, and barrier strip inputs
  • Touch-proof binding post and Neutrik Speakon® outputs
  • Front mounted gain controls for easy access
  • Signal and clip LED indicators for monitoring performance
  • Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers
  • 3-year warranty plus optional 3-year extended service contract
Power per Channel, Stereo Mode (both channels driven)
8Ω, FTC 20 Hz–20 kHz, 0.1% tdD 260 W
8Ω, EIA 1 kHz, 0.1% tdD 300 W
4Ω, FTC 20 Hz–20 kHz, 0.1% tdD 400 W
4Ω, EIA 1 kHz, 0.1% tdD 500 W (0.5% tdD)
2Ω, EIA 1 kHz, 1% tdD 700 W
Power, Bridge-Mono Mode
8Ω, FTC 20 Hz–20 kHz, 0.1% tdD 800 W
8Ω, EIA 1 kHz, 0.1% tdD 900 W
4Ω, EIA 1 kHz, 1% tdD 1400 W
Signal to Noise (20 Hz - 20 kHz) -100 dB
Distortion (SMPTE-IM) < 0.01%
Input Sensitivity at 8Ω 1.15V (+3.4dBu)
Voltage Gain 40x (32 dB)
Output Circuitry Class AB
Current Draw (120 V AC)
Typical, 1/8 power pink noise at 4Ω* 6.0 A
Severe, 1/3 power pink noise at 4Ω* 9.6 A
AC Mains Plug
NEMA 5-15
Distortion (typical)
20 Hz–20 kHz, 10 dB below rated power < 0.03% tdD, 4Ω and 8Ω
1 kHz and below, full rated power < 0.03% tdD, 4Ω and 8Ω
Frequency Response 20 Hz–20 kHz: +0/-1 dB -3 dB points: 5 Hz and 50 kHz (LF filter bybassed, 8Ω)
Damping Factor (1 kHz and below) > 300 at 8Ω
Input Impedance 10 kΩ unbalanced; 20 kΩ balanced
Input Stage Clipping 10 V rms (+22 dBu)
Cooling Continuously variable speed fan, back-to-front air flow
Connectors (each channel) Input: Active balanced; 3-pin Euro-style detachable terminal block and XLR (pin 2+)
Output: Touch-proof binding posts; Neutrik Speakon®
Controls Front: AC switch; Channel 1 & 2 gain knobs
Rear: 10-position DIP switch
LED Indicators Power on: Green; Signal: Yellow (1 per channel); Clip/Protect: Red (1 per channel)
Amplifier Protection Full short circuit, open circuit, tdermal, ultrasonic, RF protection. Stable into reactive or mismatched loads
Load Protection Turn-on/off muting; AC coupling (850, 1450); Triac crowbar (1850HD, 2450, 4050HD, 5050) on each channel
Load Protection Turn-on/off muting; AC coupling (850, 1450); Triac crowbar (1850HD, 2450, 4050HD, 5050) on each channel
Carton Dimensions (H×W×D) 24 × 22 × 6 in
Shipping Weight 46 lb
Power Requirements 100, 120, 230 V AC (factory configured), 50–60 Hz
  • 1x QSC RMX1450a Power Amplifier
  • Power Cable
  • User's Manual

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